/*
 * Copyright 2002 Sun Microsystems, Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 *
 * - Redistribution in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in
 *   the documentation and/or other materials provided with the
 *   distribution.
 *
 * Neither the name of Sun Microsystems, Inc. or the names of
 * contributors may be used to endorse or promote products derived
 * from this software without specific prior written permission.
 *
 * This software is provided "AS IS," without a warranty of any
 * kind. ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND
 * WARRANTIES, INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY
 * EXCLUDED. SUN AND ITS LICENSORS SHALL NOT BE LIABLE FOR ANY DAMAGES
 * SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
 * DISTRIBUTING THE SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN
 * OR ITS LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR
 * FOR DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR
 * PUNITIVE DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF
 * LIABILITY, ARISING OUT OF THE USE OF OR INABILITY TO USE SOFTWARE,
 * EVEN IF SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
 *
 * You acknowledge that Software is not designed, licensed or intended
 * for use in the design, construction, operation or maintenance of
 * any nuclear facility.
 */
package com.sun.j2ee.blueprints.mailer.ejb;

import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.StringReader;
import java.net.URL;

import javax.xml.transform.Result;
import javax.xml.transform.Source;
import javax.xml.transform.stream.StreamResult;
import javax.xml.transform.stream.StreamSource;

import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;

import com.sun.j2ee.blueprints.xmldocuments.XMLDocumentException;
import com.sun.j2ee.blueprints.xmldocuments.XMLDocumentUtils;

public class Mail {
	public static final String DTD_PUBLIC_ID = "-//Sun Microsystems, Inc. - J2EE Blueprints Group//DTD OPC Mail 1.0//EN";
	public static final String DTD_SYSTEM_ID = "/com/sun/j2ee/blueprints/mailer/rsrc/schemas/Mail.dtd";
	public static final boolean VALIDATING = true;
	public static final String XML_MAIL = "Mail";
	public static final String XML_SUBJECT = "Subject";
	public static final String XML_ADDRESS = "Address";
	public static final String XML_CONTENT = "Content";
	private String address = null;
	private String subject = null;
	private String content = null;

	private Mail() {
	}

	public Mail(String address, String subject, String content) {
		this.address = address;
		this.subject = subject;
		this.content = content;
		return;
	}

	// getters

	public String getAddress() {
		return address;
	}

	public String getSubject() {
		return subject;
	}

	public String getContent() {
		return content;
	}

	// XML (de)serialization methods

	public void toXML(Result result) throws XMLDocumentException {
		toXML(result, null);
		return;
	}

	public String toXML() throws XMLDocumentException {
		return toXML((URL) null);
	}

	public void toXML(Result result, URL entityCatalogURL)
			throws XMLDocumentException {
		if (entityCatalogURL != null) {
			XMLDocumentUtils.toXML(toDOM(), DTD_PUBLIC_ID, entityCatalogURL,
					XMLDocumentUtils.DEFAULT_ENCODING, result);
		} else {
			XMLDocumentUtils.toXML(toDOM(), DTD_PUBLIC_ID, DTD_SYSTEM_ID,
					XMLDocumentUtils.DEFAULT_ENCODING, result);
		}
		return;
	}

	public String toXML(URL entityCatalogURL) throws XMLDocumentException {
		try {
			ByteArrayOutputStream stream = new ByteArrayOutputStream();
			toXML(new StreamResult(stream), entityCatalogURL);
			// System.err.println("toXML: " +
			// stream.toString(XMLDocumentUtils.DEFAULT_ENCODING));
			return stream.toString(XMLDocumentUtils.DEFAULT_ENCODING);
		} catch (Exception exception) {
			throw new XMLDocumentException(exception);
		}
	}

	public static Mail fromXML(Source source) throws XMLDocumentException {
		return fromXML(source, null, VALIDATING);
	}

	public static Mail fromXML(String buffer) throws XMLDocumentException {
		return fromXML(buffer, null, VALIDATING);
	}

	public static Mail fromXML(Source source, URL entityCatalogURL,
			boolean validating) throws XMLDocumentException {
		return fromDOM(XMLDocumentUtils.fromXML(source, DTD_PUBLIC_ID,
				entityCatalogURL, validating).getDocumentElement());
	}

	public static Mail fromXML(String buffer, URL entityCatalogURL,
			boolean validating) throws XMLDocumentException {
		// System.err.println(buffer);
		try {
			return fromXML(new StreamSource(new StringReader(buffer)),
					entityCatalogURL, validating);
		} catch (XMLDocumentException exception) {
			System.err.println(exception.getRootCause().getMessage());
			throw new XMLDocumentException(exception);
		}
	}

	public Document toDOM() throws XMLDocumentException {
		Document document = XMLDocumentUtils.createDocument();
		Element root = (Element) toDOM(document);
		document.appendChild(root);
		return document;
	}

	public Node toDOM(Document document) {
		Element root = document.createElement(XML_MAIL);
		XMLDocumentUtils.appendChild(document, root, XML_ADDRESS, address);
		XMLDocumentUtils.appendChild(document, root, XML_SUBJECT, subject);
		XMLDocumentUtils.appendChild(document, root, XML_CONTENT, content);
		return root;
	}

	private static Mail fromDOM(Node node) throws XMLDocumentException {
		Element element;
		if (node.getNodeType() == Node.ELEMENT_NODE
				&& (element = ((Element) node)).getTagName().equals(XML_MAIL)) {
			Element child;
			Mail mail = new Mail();
			mail.address = XMLDocumentUtils.getContentAsString(
					child = XMLDocumentUtils.getFirstChild(element,
							XML_ADDRESS, false), false);
			mail.subject = XMLDocumentUtils.getContentAsString(
					child = XMLDocumentUtils.getNextSibling(child, XML_SUBJECT,
							false), false);
			mail.content = XMLDocumentUtils.getContentAsString(
					child = XMLDocumentUtils.getNextSibling(child, XML_CONTENT,
							false), false);
			return mail;
		}
		throw new XMLDocumentException(XML_MAIL + " element expected.");
	}

	public static void main(String[] args) {
		if (args.length <= 1) {
			String fileName = args.length > 0 ? args[0] : "Mail.xml";
			try {
				Mail mail = Mail.fromXML(new StreamSource(new FileInputStream(
						new File(fileName)), fileName));
				System.out.println(Mail.fromXML(mail.toXML()).getContent());
				System.exit(0);
			} catch (IOException exception) {
				System.err.println(exception);
				System.exit(2);
			} catch (XMLDocumentException exception) {
				System.err.println(exception.getRootCause());
				System.exit(2);
			}
		}
		System.err.println("Usage: " + Mail.class.getName() + " [file-name]");
		System.exit(1);
	}
}
